Highly Stable Na: CsPb(Br, I)3@Al2O3 Nanocomposites Prepared by Pre-protection Strategy

Abstract

Among the leading energy materials, metal tri-halide perovskite quantum dots (PQDs) with outstanding optoelectronic properties are still at the forefront of current research. However, the enormous challenges, including hazardous components and poor stability, remain to be addressed urgently problems before fulfilling its practical applications. Although there are diverse methods to improve the stability of PQDs, it is of central importance to avoid damage during operation. Herein, we develop a pre-protected strategy in which the coating combines the advantages of doping with sodium ions to jointly improve stability. Since the stable Na-rich surface acts as the defence, it protectes PQDs from damage during the coating process and therefore retains its initial fluorescence. When employing these Na-rich PQDs as core materials of coating, the highly fluorescent Na: CsPb(Br,I)3@Al2O3 nanocomposites can maintain good stability even when directly immersed in water or exposed to illumination. Needless to say, the combination of these features sheds some light on the stabilization and applications of PQDs.